Kenneth Rogoff never intended to be a political actor. But since the financial crisis hit, politicians and pundits have evoked the Harvard economist's research when warning about the perils of borrowing too much.
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Investor Rajiv Sharma checks his portfolio at the Australian Stock Exchange as the share market reacts to the Reserve Bank of Australia's decision in Sydney on May 3, 2011. Australia's central bank kept interest rates unchanged at 4.75 percent, in line with expectations, but warned of possible ris

The new German central bank president Jens Weidmann delivers his speech a handing-over ceremony from outgoing German central bank president Axel Weber at the Bundesbank headquarters in Frankfurt/M., western Germany, on May 2, 2011.

ARLINGTON, VA - APRIL 29: Federal Reserve Chairman Ben Bernanke waits to speak during a luncheon at the 7th Federal Reserve Community Affairs Research Conference April 29, 2011 in Arlington,VA. The conference discusses challenges facing low-income communities and community development policy.